<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .header {
            height: 50px;
            background-color: red;
        }

        .nav {
            height: 30px;
            background-color: pink;
        }

        .content {
            height: 500px;
        }

        .footer {
            height: 80px;
            background-color: blue;
        }

        .left {
            float: left;
            height: 500px;
            width: 33.33%;
            background-color: antiquewhite;
        }

        .middle {
            float: left;
            height: 500px;
            width:  33.33%;
            background-color: aqua;
        }

        .right {
            float: left;
            height: 500px;
            width:  33.33%;
            background-color: blueviolet;
        }

    </style>
</head>
<body>
<div class="container">
    <div class="header"></div>
    <div class="nav"></div>
    <div class="content">
        <div class="left"></div>
        <div class="middle"></div>
        <div class="right"></div>
    </div>
    <div class="footer"></div>
</div>
</body>
</html>